function relcontenus(){
	var model=document.form_6.model.value;
	var i;
	var ch="";
	var ch2=document.form_6.s.value;
	for (i=0;i<document.form_6.t.length;i++)
	{
		if(document.form_6.t[i].checked) {ch=document.form_6.t[i].value+" "+ch;}
	}

var xhr = null;
	
	if (ch == ""||ch2=="")
		alert("ERREUR : Selection!!");
	else {
		if (window.XMLHttpRequest) {
			xhr = new XMLHttpRequest();
		} else if (window.ActiveXObject) {
			xhr = new ActiveXObject("Microsoft.XMLHTTP");
		}
		xhr.open("GET", "Select3_query.jsp?ch="+ ch + "&ch2=" + ch2 + "&model=" + model, false);
				xhr.send(null);
				
		
	
		document.getElementById("rst2").innerHTML = xhr.responseText;
	}
}
